# from time import sleep
# class Clock(object):
#     """数字时钟"""
#     def __init__(self, hour=0, minute=0, second=0):
#         """初始化方法
#         :param hour: 时
#         :param minute: 分
#         :param second: 秒
#         """
#         self._hour = hour
#         self._minute = minute
#         self._second = second
#     def run(self):
#         """走字"""
#         self._second += 1
#         if self._second == 60:
#             self._second = 0
#             self._minute += 1
#             if self._minute == 60:
#                 self._minute = 0
#                 self._hour += 1
#                 if self._hour == 24:
#                     self._hour = 0
#     def show(self):
#         """显示时间"""
#         return '%02d:%02d:%02d' % \
#                (self._hour, self._minute, self._second)
# def main():
#     clock = Clock(23, 59, 58)
#     while True:
#         print(clock.show())
#         sleep(1)
#         clock.run()
# if __name__ == '__main__':
#     main()
from time import sleep
class Clock(object):
    def __init__(self,hour=0,minute=0,second=0):
        self._hour = hour
        self._minute =minute
        self._second =second
    def run(self):
        self._second +=1
        if self._second == 60:
            self._second = 0
            self._minute +=1
            if self._minute == 60:
                self._minute = 0
                self._hour +=1
                if self._hour == 24:
                    self._hour = 0
    def show(self):
        return'%02d:%02d:%02d' % \
            (self._hour,self._minute,self._second)
def main():
    clock = Clock(23,59,58)
    while True:
        print(clock.show())
        sleep(1)
        clock.run()
if __name__=='__main__':
    main()